new at using stacks

Okay so here goes. I am such a noob. When connecting a amplifiers to more than one speaker cabinet should I connect both cabs to the head or the head to one cab then cab to the other cab? I really need help cause I can't find and diagrams stating this. I appreciate the help. Oh by the way both cabs are 8ohm and the head can take a load of 4ohm. Thanks for the input

Thanks for the input. Just feel like a dufus for not knowing that but I am horrible with electronics and have never had to actually use anything other than a half stack. Now that I am in the full stack range I wanted to make sure that I didn't blow something up in the process.